A blender is a petroleum industry machinery operator who controls specialized equipment during the petroleum refining process. Your job usually involves weighing and measuring additives and then mixing them with petroleum in specialized tanks. As this technology is now controlled by integrated computer systems, a career as blender requires you have computer skills. Nonetheless, it is still a physically oriented occupation, and a blender should be able to lift at least 50 lbs. A career as a blender does not require you to have a college degree, and most employers hire applicants with a high school diploma. Most professional blenders transition into the career after gaining experience in an entry-level oil refining job.